Travel shooters should check out PhotoSecrets: Travel Guides for Travel Photography. The site specializes in info on northern California, but there's lots more, including links to other interesting and related sites.
The Mountain Gallery features some great shots of rock climbing and mountaineering, from the Alps of Europe to Denali in Alaska. There's also photo tips and links to other photo info.
The Time-Life Photo Gallery Home Page contains some neat nostalgic stuff, from shots of celebrities to WWII action photos.
Kodak, the folks with the yellow boxes, are busy branching out. Check them out for some great stuff on digital imaging.
If you are into photojournalism, The Michigan Press Photographers Association Home Page is a good place to look. From there, links to other sites can send you deeper into the subject.
Kai's Power Tips and Tricks for Adobe Photoshop is a terrific site for lots of digital imaging goodies, links to other sites, and more.
The site for famous photo agency BlackStar is quite interesting itself, besides being a source of links to other photo sites, e-zines, Usenet photo newsgroups, and photo related mailing lists.
The University of California, Riverside, offers some neat stuff at the California Museum of Photography. Featured are projects by contemporary artists, student work, historical selections from San Francisco, stereoscopic images from pre-revolutionary Russia (1895-1910), and more.
At the Hot Pictures Electronic Photo Gallery you can view the work of contemporary Russian photographers, straight from the former Soviet Union.
Ansel Adams needs no introduction. Enjoy this exhibit featuring his work; Ansel Adams, Fiat Lux.
The Classic Rock Photo Gallery is just what the name implies and well worth a visit. There is more here than you think--check it out.